1. First, create a new word document. When you open it, you will see that the title is automatically numbered, without multiple levels.

2. In the next step, click the menu bar-Multi-level list menu option.

3. You can see that in the pop-up interface, you need to click to define a new multilevel list.

4. After entering the dialog box for defining a new multilevel list, click the More button at the bottom immediately to expand more contents.

5. Pay attention to the link level to the style after expansion-no style by default.

6. Then select the first level-link the level to the style. Select the title1here-and so on until it is set to the required level.

7, you can see-and then set the secondary title.

8. After saving the settings and exiting-you can see that the title has a multi-level list in the menu, and it is finished.